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This study evaluated the potential of coated microneedles for improved dermal delivery of 5-aminolevulinic acid (5-ALA), which naturally gets converted by cells of the tissue in to a photosensitizer called protoporphyrin IX (PPIX). Microneedle patches containing 57 microneedles were coated with 5-ALA using an in-house developed micro-precision dip coater. The coating process was optimized to achieve...
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